Electret capacitor microphone

Details Electret capacitor microphone Electret capacitor microphone

2005-07-19

2005-07-19

Le, Huyen D. (Department: 2643)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Microphone capsule only

C381S369000, C381S191000

Reexamination Certificate

active

06920225

ABSTRACT:
To provide an electret capacitor microphone in which change of sensitivity characteristic caused by thermal deformation of an electret layer can be prevented even in the case where a reflow process is carried out. An electret capacitor microphone includes: an electret capacitor portion including a diaphragm, and a back electrode plate disposed opposite to the diaphragm through a spacer; an electrically insulating bush for electrically insulating/supporting an outer circumferential edge portion of the back electrode plate; a metal cover in which the electret capacitor portion and the electrically insulating bush are stored; and a gate spring having a pressing function for elastically pressing the back electrode plate toward the diaphragm to form a predetermined gap between the electrically insulating bush and an inner surface of a rear wall of the metal cover. Consequently, collapse of a spacer-abutting portion of an electret layer is prevented from being caused by thermal expansion.

REFERENCES:
patent: 4281222 (1981-07-01), Nakagawa et al.
patent: 4321432 (1982-03-01), Matsutani et al.
patent: 6512833 (2003-01-01), Himori et al.
patent: 2003/0161491 (2003-08-01), Yonehara et al.
patent: 11-187494 (1999-07-01), None

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